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H. Bluhm, G. Fieg, H. Werle
Nuclear Science and Engineering | Volume 54 | Number 3 | July 1974 | Pages 300-316
Technical Paper | doi.org/10.13182/NSE74-A23420
Articles are hosted by Taylor and Francis Online.
The neutron spectra on the central axis of a massive block of uranium depleted in the 235U isotope have been measured using spherical proton-recoil and 3He semiconductor-sandwich spectrometers. The experimental spectra are compared to calculated multigroup spectra obtained with a 208-group constant cross-section set which is based on KEDAK cross sections. By parametric variation of all relevant nuclear data, the sensitivity of the spectra to changes in the 238U cross sections is determined. The 238U capture and inelastic scattering cross sections are adjusted to bring the calculations in line with the experiment. It is shown that the resulting adjusted 238U cross sections also lead to considerably better agreement between experimental and theoretical results for other fast assemblies which are sensitive to changes in the 238U cross sections.
